/// <summary>
/// Send a SYN request to the next port to check it's state.
/// </summary>
private void SendRequest()
{
m_remoteEndPoint.Port = m_ports [m_portIndex];
// increment the local port.
if (m_incPorts)
{
if (m_localEndPoint.Port == ushort.MaxValue)
{
m_localEndPoint.Port = 1024;
}
m_localEndPoint.Port++;
}
IpV4Packet ipHeader = new IpV4Packet();
// fill in the minimal IP fields
ipHeader.DestinationAddress = m_remoteEndPoint.Address;
ipHeader.SourceAddress = m_localEndPoint.Address;
TcpPacket tcpHeader = new TcpPacket();
// fill in the minimal tcp fields
tcpHeader.DestinationPort = (ushort)m_remoteEndPoint.Port;
tcpHeader.SourcePort = (ushort)m_localEndPoint.Port;
tcpHeader.SetFlag(TcpFlags.Synchronize, true);
// send the request
ipHeader.Data = tcpHeader.Serialize(m_localEndPoint.Address, m_remoteEndPoint.Address);
// send each fragment
if (m_fragment)
{
IpV4Packet[] fragments = ipHeader.Fragment(8);
for (int i = 0; i < fragments.Length; i++)
{
byte[] packet = fragments[i].Serialize();
m_socket.SendTo(packet, 0, packet.Length, SocketFlags.None, new IPEndPoint(fragments[i].DestinationAddress, 0));
}
}
// send the packet
else
{
byte[] packet = ipHeader.Serialize();
m_socket.SendTo(packet, 0, packet.Length, SocketFlags.None, new IPEndPoint(ipHeader.DestinationAddress, 0));
}
// start the time out timer
m_timeoutTimer.Enabled = true;
}
